Reply to Mixing mp3 with vinyl

Hi there. I'm new to this site and this is my first post. I'm new to digital mixing also having only used vinyl. I recently got a behringer ddm4000 believeing I could hook it up to my 1210s to mix my records on two of the channels with mp3s through Traktor on the other two channels. I've been trying for days to get it set up and I now feel like banging my head against a wall. Is what I'm trying to do possible or am I going to have to buy more gear ? I hope not...
Any help will be very greatly appreciated. Cheers.